[PATCH 1/3] hw/loongarch/virt: Modify ipi as percpu device

[Song Gao]

ipi is used to communicate between cpus, this patch modified
loongarch ipi device as percpu deivce, so that there are
2 MemoryRegions with ipi device, rather than 2*cpus
MemoryRegions, which may be large than QDEV_MAX_MMIO if
more cpus are added on loongarch virt machine.

Signed-off-by: Song Gao <gaosong@loongson.cn>
---
 hw/intc/loongarch_ipi.c         | 32 ++++++++++----------------------
 hw/loongarch/virt.c             | 12 ++++++------
 include/hw/intc/loongarch_ipi.h | 10 ++++------
 include/hw/loongarch/virt.h     |  1 -
 4 files changed, 20 insertions(+), 35 deletions(-)

diff --git a/hw/intc/loongarch_ipi.c b/hw/intc/loongarch_ipi.c
index aa4bf9eb74..0563d83a35 100644
--- a/hw/intc/loongarch_ipi.c
+++ b/hw/intc/loongarch_ipi.c
@@ -201,27 +201,17 @@ static const MemoryRegionOps loongarch_ipi64_ops = {
 
 static void loongarch_ipi_init(Object *obj)
 {
-    int cpu;
-    LoongArchMachineState *lams;
     LoongArchIPI *s = LOONGARCH_IPI(obj);
     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
-    Object *machine = qdev_get_machine();
-    ObjectClass *mc = object_get_class(machine);
-    /* 'lams' should be initialized */
-    if (!strcmp(MACHINE_CLASS(mc)->name, "none")) {
-        return;
-    }
-    lams = LOONGARCH_MACHINE(machine);
-    for (cpu = 0; cpu < MAX_IPI_CORE_NUM; cpu++) {
-        memory_region_init_io(&s->ipi_iocsr_mem[cpu], obj, &loongarch_ipi_ops,
-                            &lams->ipi_core[cpu], "loongarch_ipi_iocsr", 0x48);
-        sysbus_init_mmio(sbd, &s->ipi_iocsr_mem[cpu]);
 
-        memory_region_init_io(&s->ipi64_iocsr_mem[cpu], obj, 
&loongarch_ipi64_ops,
-                              &lams->ipi_core[cpu], "loongarch_ipi64_iocsr", 
0x118);
-        sysbus_init_mmio(sbd, &s->ipi64_iocsr_mem[cpu]);
-        qdev_init_gpio_out(DEVICE(obj), &lams->ipi_core[cpu].irq, 1);
-    }
+    memory_region_init_io(&s->ipi_iocsr_mem, obj, &loongarch_ipi_ops,
+                          &s->ipi_core, "loongarch_ipi_iocsr", 0x48);
+    sysbus_init_mmio(sbd, &s->ipi_iocsr_mem);
+
+    memory_region_init_io(&s->ipi64_iocsr_mem, obj, &loongarch_ipi64_ops,
+                          &s->ipi_core, "loongarch_ipi64_iocsr", 0x118);
+    sysbus_init_mmio(sbd, &s->ipi64_iocsr_mem);
+    qdev_init_gpio_out(DEVICE(obj), &s->ipi_core.irq, 1);
 }
 
 static const VMStateDescription vmstate_ipi_core = {
@@ -233,7 +223,7 @@ static const VMStateDescription vmstate_ipi_core = {
         VMSTATE_UINT32(en, IPICore),
         VMSTATE_UINT32(set, IPICore),
         VMSTATE_UINT32(clear, IPICore),
-        VMSTATE_UINT32_ARRAY(buf, IPICore, MAX_IPI_MBX_NUM * 2),
+        VMSTATE_UINT32_ARRAY(buf, IPICore, 2),
         VMSTATE_END_OF_LIST()
     }
 };
@@ -243,9 +233,7 @@ static const VMStateDescription vmstate_loongarch_ipi = {
     .version_id = 0,
     .minimum_version_id = 0,
     .fields = (VMStateField[]) {
-        VMSTATE_STRUCT_ARRAY(ipi_core, LoongArchMachineState,
-                             MAX_IPI_CORE_NUM, 0,
-                             vmstate_ipi_core, IPICore),
+        VMSTATE_STRUCT(ipi_core, LoongArchIPI, 0, vmstate_ipi_core, IPICore),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c
index f4bf14c1c8..c8a01b1fb6 100644
--- a/hw/loongarch/virt.c
+++ b/hw/loongarch/virt.c
@@ -565,9 +565,6 @@ static void loongarch_irq_init(LoongArchMachineState *lams)
     CPUState *cpu_state;
     int cpu, pin, i, start, num;
 
-    ipi = qdev_new(TYPE_LOONGARCH_IPI);
-    sysbus_realize_and_unref(SYS_BUS_DEVICE(ipi), &error_fatal);
-
     extioi = qdev_new(TYPE_LOONGARCH_EXTIOI);
     sysbus_realize_and_unref(SYS_BUS_DEVICE(extioi), &error_fatal);
 
@@ -598,15 +595,18 @@ static void loongarch_irq_init(LoongArchMachineState 
*lams)
         lacpu = LOONGARCH_CPU(cpu_state);
         env = &(lacpu->env);
 
+        ipi = qdev_new(TYPE_LOONGARCH_IPI);
+        sysbus_realize_and_unref(SYS_BUS_DEVICE(ipi), &error_fatal);
+
         /* connect ipi irq to cpu irq */
-        qdev_connect_gpio_out(ipi, cpu, qdev_get_gpio_in(cpudev, IRQ_IPI));
+        qdev_connect_gpio_out(ipi, 0, qdev_get_gpio_in(cpudev, IRQ_IPI));
         /* IPI iocsr memory region */
         memory_region_add_subregion(&env->system_iocsr, SMP_IPI_MAILBOX,
                                     sysbus_mmio_get_region(SYS_BUS_DEVICE(ipi),
-                                    cpu * 2));
+                                    0));
         memory_region_add_subregion(&env->system_iocsr, MAIL_SEND_ADDR,
                                     sysbus_mmio_get_region(SYS_BUS_DEVICE(ipi),
-                                    cpu * 2 + 1));
+                                    1));
         /* extioi iocsr memory region */
         memory_region_add_subregion(&env->system_iocsr, APIC_BASE,
                                 sysbus_mmio_get_region(SYS_BUS_DEVICE(extioi),
diff --git a/include/hw/intc/loongarch_ipi.h b/include/hw/intc/loongarch_ipi.h
index 0ee48fca55..664e050b92 100644
--- a/include/hw/intc/loongarch_ipi.h
+++ b/include/hw/intc/loongarch_ipi.h
@@ -28,9 +28,6 @@
 #define MAIL_SEND_OFFSET      0
 #define ANY_SEND_OFFSET       (IOCSR_ANY_SEND - IOCSR_MAIL_SEND)
 
-#define MAX_IPI_CORE_NUM      4
-#define MAX_IPI_MBX_NUM       4
-
 #define TYPE_LOONGARCH_IPI "loongarch_ipi"
 OBJECT_DECLARE_SIMPLE_TYPE(LoongArchIPI, LOONGARCH_IPI)
 
@@ -40,14 +37,15 @@ typedef struct IPICore {
     uint32_t set;
     uint32_t clear;
     /* 64bit buf divide into 2 32bit buf */
-    uint32_t buf[MAX_IPI_MBX_NUM * 2];
+    uint32_t buf[2];
     qemu_irq irq;
 } IPICore;
 
 struct LoongArchIPI {
     SysBusDevice parent_obj;
-    MemoryRegion ipi_iocsr_mem[MAX_IPI_CORE_NUM];
-    MemoryRegion ipi64_iocsr_mem[MAX_IPI_CORE_NUM];
+    MemoryRegion ipi_iocsr_mem;
+    MemoryRegion ipi64_iocsr_mem;
+    IPICore ipi_core;
 };
 
 #endif
diff --git a/include/hw/loongarch/virt.h b/include/hw/loongarch/virt.h
index 7ae8a91229..54a9f595bb 100644
--- a/include/hw/loongarch/virt.h
+++ b/include/hw/loongarch/virt.h
@@ -36,7 +36,6 @@ struct LoongArchMachineState {
     /*< private >*/
     MachineState parent_obj;
 
-    IPICore ipi_core[MAX_IPI_CORE_NUM];
     MemoryRegion lowmem;
     MemoryRegion highmem;
     MemoryRegion isa_io;
-- 
2.31.1